package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 *  @DefaultProperties: 1.每一个方法配置一个服务降级方法，技术上可以，实际上傻叉
 *                      2.N除了个别重要的核心业务有专属，其他普通方法的可以通过@DefaultProperties(defaultFallback = "")统一跳转到统一处理结果页面
 */
@Service
//@DefaultProperties(defaultFallback = "")
public class PaymentService {

    /**
     * 正常访问，肯定ok的方法
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id){
        return "线程池:    " +
                Thread.currentThread().getName()
                + "    paymentInfo_OK, id: " + id + "\t" + "O(∩_∩)O哈哈~";
    }

    /**
     * HystrixCommand:定义出现报错等指定情况情况后（本例子为指定执行三秒，超过三秒也相当于报错，执行定义的paymentInfo_TimetOut方法）执行指定方法，方法名:paymentInfo_TimeOutHandler
     *
     * commandProperties:设置自身调用超过时间的峰值，峰值内可以正常运行，超过了需要有兜底的方法处理，作服务降级fallback
     */
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler"
            ,commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "5000"
            )
    })
    public String paymentInfo_TimetOut(Integer id){

        int timeNumber = 5;

        try {
            TimeUnit.SECONDS.sleep(timeNumber);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        int i = 1/0;

        return "线程池:    " +
                Thread.currentThread().getName()
                + "    paymentInfo_TimeOut, id: " + id + "\t" + "O(∩_∩)O哈哈~ 耗时(s)"+ timeNumber;
    }

    public String paymentInfo_TimeOutHandler(Integer id){

        return "线程池" + Thread.currentThread().getName() + " 系统繁忙或者运行报错，请稍后再试,id: " +id + "\t"+ "o(╥﹏╥)o";

    }

    /**
     *  服务熔断器
     *
     *  本次按理为在10s内，请求10次，失败率达到60%，则跳闸
     */
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),//是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),//请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"),//时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60")//失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id){
        if (id < 0){
            throw new RuntimeException("******id 不能为负数");
        }
        String serialNumber = IdUtil.randomUUID();

        return Thread.currentThread().getName()+ "\t" + "调用成功，流水号: " + serialNumber;
    }

    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id){
        return "id 不能为负数，请稍后再试，o(╥﹏╥)o  id:" + id;
    }
}
